CHICAGO (AP) — Construction equipment is starting to take big bites out of Wrigley Field’s exterior outfield walls.

The demolition of the historic ballpark’s bleachers is part of a project to build a large electronic sign and six other outfield signs.

Cubs spokesman Julian Green said Thursday the affected walls won’t be rebuilt for several weeks. Green said the ivy-covered outfield wall is safe from demolition.

The work is part of the Cubs’ privately funded $575 million renovation project, which started despite a legal fight involving owners of rooftop businesses across the street. Those businesses fear their views of the field will be blocked and they have sued the city.

The team and Major League Baseball Commissioner Bud Selig took part in a ceremonial groundbreaking on Saturday.

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